- it's proven to be the worst of the E30 engines
- many documented problems
- common upgrades: none
- if you're looking for more power, consider an engine swap...
Okay, so there's not a lot of love out there for the poor thing. It makes me wonder why they ended up putting it in the design edition tourings in the first place when there were so many better options at the time?

E30 Zone has the best description of one of the common problems to look out for with the M40:
If the engine sound can be described as "sounding like a skeleton wanking in a dustbin" then your cam is very likely worn.

Aw, thanks! If you're in the market for an E30 anyway, what would stop you from going after one? :p






















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